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  • The number of Faradays (F) required to produce 20 g of calcium from molten  (At

The number of Faradays (F) required to produce 20 g of calcium from molten \mathrm{CaCl_{2}} (Atomic mass of \mathrm{Ca=40 g\; mol^{-1}}) is :

Option: 1

 4 


Option: 2

1


Option: 3

2

 


Option: 4

 3


Answers (1)

best_answer

Moles of Ca present in 20 g is 0.5.

\mathrm{Ca^{2+} \xrightarrow{+2e^-} Ca}

For 1 mol of Ca need 2 moles of electrons.

So, for 0.5 mole of Ca need 1 mole of electrons

Hence, 1 mole of electrons means 1 Faraday of charge will be required for the process.

Therefore, Option(2) is correct.

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